diff --git a/Texassemble/texassemble.cpp b/Texassemble/texassemble.cpp
index 0d3dfcb..3aef303 100644
--- a/Texassemble/texassemble.cpp
+++ b/Texassemble/texassemble.cpp
@@ -25,6 +25,7 @@
 #include <cstddef>
 #include <cstdio>
 #include <cstdlib>
+#include <cstring>
 #include <cwchar>
 #include <cwctype>
 #include <fstream>
diff --git a/Texconv/PortablePixMap.cpp b/Texconv/PortablePixMap.cpp
index 7e2a221..c31768d 100644
--- a/Texconv/PortablePixMap.cpp
+++ b/Texconv/PortablePixMap.cpp
@@ -23,6 +23,7 @@
 
 #include <cstddef>
 #include <cstdint>
+#include <cstdio>
 #include <memory>
 #include <new>
 #include <tuple>
diff --git a/Texconv/texconv.cpp b/Texconv/texconv.cpp
index 471ea16..6b5e62a 100644
--- a/Texconv/texconv.cpp
+++ b/Texconv/texconv.cpp
@@ -26,6 +26,7 @@
 #include <cstddef>
 #include <cstdio>
 #include <cstdlib>
+#include <cstring>
 #include <cwchar>
 #include <cwctype>
 #include <fstream>
diff --git a/Texdiag/texdiag.cpp b/Texdiag/texdiag.cpp
index d948579..37bc46a 100644
--- a/Texdiag/texdiag.cpp
+++ b/Texdiag/texdiag.cpp
@@ -25,6 +25,7 @@
 #include <cstddef>
 #include <cstdio>
 #include <cstdlib>
+#include <cstring>
 #include <cwchar>
 #include <cwctype>
 #include <fstream>